While heading south to the Tampa RV show and FROG rally, I had been using my dash heater (6 degrees when I left NY for FLA). When I stopped the first night, as I pulled into the campground, the fan stopped working. I shut the fan off and it came back on a short time later. Yesterday, when I wanted to use the fan for cooling, (now in FLA) it would not come on at all. Checked for fuses but didn't see one for the blower. Called the Freightliner help line and they said that unit was installed by the FR so it is the coach manufacturers issue. I can hear the doors on the unit moving when I change from heat to AC to defrost but the fan does not work at all. Has anyone had this problem and if so, how was it resolved?
Thanks
Tom

I had intermittent operation of the fan. Could be going down the road with the fan operating and hit a harsh bump and it would quit. It was frustrating and difficult to chase down but it turned out to be a bad splice in the wire harness. I pulled that lid off the dash and followed the fan control wires back into the wire bundle. Had to remove several inches of electrical tape but when I got to the splice the power wire fell out of the crimped butt connector. Installed a new butt connector and crimped it really good....problem solved.

Inside the dash. Pull the cover off and follow the wire bundle from the dash fan/heater control back into the bigger wire bundle that has a large amount of electrical tape. It is necessary to remove the tape from about 6 in of the bundle. If memory serves me right the power lead wiire color changes at the splice.

There is also the possibility it is the resistor pack on the blower. Have you checked for power passing from the blower switch toward the blower motor?

tmmar, just adding to the loose ground probability. We lost our blower last winter while returning home. It fluctuated a few minutes, on then off then on then nothing. Our ground actually came loose at the blower motor itself. I borrowed on of those snake light camera deals and stuck it inside the dash and finally found the wire just hanging there - screw on the floor. Not simple to get to, but fixed once there. Good luck to you - hope it's that simple!